Zirconia all-ceramic teeth, if properly made and used, generally show less wear, even over time. If zirconia all-ceramic teeth show wear, there may be several reasons: 1. Trauma, such as by external forces, after biting hard objects. 2. Production factors, such as local angular sharp edges, stress concentration is easy to break and casting restorations surface trachoma. 3. Excessive occlusal force, in the deep overjet, tight bite, easy to wear. 4. Excessive jaw adjustment and abrasion, due to insufficient preparation of the teeth, or elongation of the affected teeth after preparation, the jaw surface has been worn too thin when wearing teeth. 5. Excessive abrasion, such as chewing hard objects and bruxism. And if properly made and used, even after a long time, the general wear is less. It is specifically recommended to consult a professional doctor.